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公开(公告)号：US2228945A
公开(公告)日：1941-01-14
申请号：US19594038
申请日：1938-03-15
Applicant: RCA CORP
Inventor： BRUINING HAJO , BOER JAN HENDRIK DE , VEENEMANS CORNELIS FREDERIK
IPC: H01J43/28
CPC classification number: H01J43/28
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